This is one of the hardest questions any parent of a child with a disability ever sits with. The honest answer is that no single document, person, or account does it alone. A real plan rests on four pillars: the right legal documents, a funded financial plan, the right people in the right roles, and the daily-life information that lets those people step in without missing a beat.
Pillar 1: The Legal Documents
The foundation is a properly drafted special needs trust (SNT), almost always a third-party SNT funded with your assets, not your child's. Because the money was never your child's, there is no Medicaid payback when they pass away. Whatever remains passes to the family members or charities you name. Anything you leave directly to your child outside the trust risks ending their SSI, AHCCCS, and ALTCS coverage the moment it lands.
Around the trust, you also need:
- A will or living trust that pours your estate into the SNT for your child's share.
- Updated beneficiary designations on retirement accounts and life insurance, naming the SNT (not your child directly) as beneficiary.
- If your child is approaching age 18 and cannot make medical or financial decisions independently, an Arizona adult guardianship or conservatorship under A.R.S. Title 14, Chapter 5 may be required. The probate court appoints a guardian of the person under A.R.S. § 14-5303 for medical and personal decisions, and a conservator under A.R.S. § 14-5401 for property and financial decisions, after notice, an evaluation, and a hearing. Where capacity is partial, a less-restrictive supported decision-making agreement may be a better fit. See how Medicare and ALTCS differ in Arizona for the benefits side.
- Powers of attorney and HIPAA releases naming the people who can act for your child.
Pillar 2: The Money Plan
A lifetime care plan needs decades of funding. The math is humbling: housing, medical care, personal support, transportation, recreation, and emergency reserves can add up to a substantial sum over a lifetime, on top of what public benefits cover.
The most common funding tools are:
- Second-to-die life insurance. Pays out after both parents are gone, when the trust needs the money most. Often the most affordable way to fund a sizeable SNT.
- Retirement accounts directed to the SNT through a properly structured see-through or accumulation provision so the SECURE Act 10-year payout does not blow up the trust.
- An AZ ABLE account for routine costs the trust cannot easily cover without reducing SSI, like rent and groceries.
- Tell relatives. Grandparents, aunts, uncles, and godparents who plan to leave anything to your child should redirect those gifts to the SNT instead. One well-meaning $25,000 outright bequest can end benefits for a year.
Pillar 3: The People
Two roles matter most, and they should usually be filled by different people:
The trustee manages the money. They invest, file taxes, follow SSI and AHCCCS spending rules, and report to beneficiaries under A.R.S. § 14-10813. They are bound by Arizona's trustee duties under A.R.S. § 14-10801 and § 14-10804. Many families pick a licensed fiduciary or corporate trustee for this role because the rules are unforgiving and the job lasts a lifetime.
The guardian or daily caregiver manages the person. They focus on housing, medical decisions, schedules, and emotional well-being. They do not control the money, which creates a built-in check on each role. Pick someone who knows your child personally and has the patience and stamina for the long haul. Always name backups.
Talk to everyone you name before you finalize the plan. Serving as trustee or guardian for an adult with a disability is a serious commitment, and the people you choose deserve to understand it before they accept.
Pillar 4: The Daily-Life Information (Letter of Intent)
A letter of intent is not a legal document, but it may be the single most useful thing you write. It tells future caregivers, trustees, and group-home staff everything they need to know about your child:
- Daily routines, sleep patterns, and food preferences (and aversions).
- Medical history, current medications, dosing schedules, doctors, and pharmacies.
- Communication preferences, sensory triggers, and what calms your child down.
- School, day-program, and therapy contacts.
- Friends, faith community, favorite activities, and the things that bring joy.
- The values you want carried forward: how you handle birthdays, holidays, family visits.
Update the letter every year. The version your successor caregiver reads should be the one written most recently, not one from a decade ago.
Putting It Together
A complete plan ties all four pillars to one another. The will and trust direct the money. The life insurance and retirement designations fund the trust. The trustee, guardian, and backups know each other and know what you expect. The letter of intent walks them through your child's day. The ABLE account handles the small things. The SNT handles the big ones.
Start while you are healthy and have time to train successors, introduce them to your child's care team, and adjust as needs change. RJP Estate Planning works hand in hand with experienced estate planning counsel who coordinate special needs planning, trust drafting, and the broader estate plan so nothing your family has built falls through the cracks.
This question is one piece of a larger picture. For the full Arizona overview, see our Special Needs Trust Arizona: Complete Guide.
Quick reference: see our SNT distribution cheatsheet for a side-by-side of 20 common expenses showing whether to pay from the SNT, the ABLE account, or not at all, and the SSI impact of each choice.